I imagine the Chief Constable would have his own ideas as to how it should have been done, if he thinks the way it was done was a mistake.

I'd not be the least surprised to turn on the telly and see that the IRA had issued a statement saying that no prison officers will be targetted and so forth. After all, that's part of the ceasefire they are pledged to uphold. But what would astonish me would be if it really reassured anyone too much. Even if it was absolutely genuine, it'd be an empty gesture - which isn't to say it wouldn't be a good idea.